Add pre-request script for LM API authentication in Postman

Scripting Other/prefetch-postman.js

@@ -0,0 +1,25 @@
+/* 
+Script to contruct the auth header for the LM API
+Should be added within Postman as a pre-request script
+LM community post with steps: 
+https://community.logicmonitor.com/discussions/product-discussions/accessing-the-logicmonitor-rest-api-with-postman-and-lmv1-api-token-authenticati/5143?topicRepliesSort=postTimeDesc
+
+Note: this script is not needed if using bearer token auth
+*/
+
+var api_id = pm.environment.get("api_id");
+var api_key = pm.environment.get("api_key");
+
+var http_verb = request.method;
+var resource_path = request.url.replace(/(^{{url}})([^\?]+)(\?.*)?/, "$2");
+var epoch = new Date().getTime();
+
+var request_vars =
+  http_verb == "GET" || http_verb == "DELETE"
+    ? http_verb + epoch + resource_path
+    : http_verb + epoch + request.data + resource_path;
+
+var signature = btoa(CryptoJS.HmacSHA256(request_vars, api_key).toString());
+var auth = "LMv1 " + api_id + ":" + signature + ":" + epoch;
+
+pm.environment.set("auth", auth);